处理规则引擎C＃中的MAX，NULL值 [英] Handle MAX, NULL values in rule engine C#

问题描述

如何在规则引擎中处理MAX，NULL值。

假设我的第一个xml元素值为null及其整数，我如何将xml元素与非null值进行比较？



我尝试了什么：



i尝试转换，但没有回复

解决方案

< blockquote>你可以这样做：

 public void ExecuteTaxRules（）
 {
 XmlDocument rules = new XmlDocument（）; 
 
 string directory = AppDomain.CurrentDomain.BaseDirectory + @\ TaxCalculator.xml; 
 
 rules.Load（directory）; 
 XmlDocument model = new XmlDocument（）; 
 
 model.LoadXml（@< Employee>< GrossSalary> 900001< / GrossSalary> 
< HRA> 50000< / HRA>< Tax>< / Tax>< ; NetSalary> 
< / NetSalary>< / Employee>）; 
 
 ROM rom = Compiler.Compile（rules）; 
 rom.AddModel（员工，型号）; 
 
 int max = 900000; 
 string grossSalary = model [Employee] [GrossSalary]。InnerText; 
 
 int grossInt; 
 int.TryParse（grossSalary，out grossInt）; 
 
 if（string.IsNullOrEmpty（grossSalary））
 {
 Console.WriteLine（Error：GrossSalary为null或为空！）; 
} 
 else if（grossInt> max）
 {
 Console.WriteLine（错误：超出GrossSalary！）; 
} 
其他
 {
 rom.Evaluate（）; 
 var tax = model [Employee] [Tax]。InnerText; 
 var NetSalary = model [Employee] [NetSalary]。InnerText; 
 var message = string.Format（Tax：{0}和Net take home salary：{1}，tax，NetSalary）; 
 Console.Write（message）; 
} 
 
 Console.Read（）; 
} 
 

How to handle MAX, NULL values in rule engine.
Suppose if my First xml element value is null and its integer, how can i compare the xml element with a non null value?

What I have tried:

i tried converting which gave me no response

解决方案

You could do it like this:

public void ExecuteTaxRules()
{
    XmlDocument rules = new XmlDocument();

    string directory = AppDomain.CurrentDomain.BaseDirectory + @"\TaxCalculator.xml";

    rules.Load(directory);
    XmlDocument model = new XmlDocument();

    model.LoadXml(@"<Employee><GrossSalary>900001</GrossSalary>
    <HRA>50000</HRA><Tax></Tax><NetSalary>
    </NetSalary></Employee>");

    ROM rom = Compiler.Compile(rules);
    rom.AddModel("Employee", model);

    int max = 900000;
    string grossSalary = model["Employee"]["GrossSalary"].InnerText;

    int grossInt;
    int.TryParse(grossSalary, out grossInt);

    if (string.IsNullOrEmpty(grossSalary))
    {
        Console.WriteLine("Error: GrossSalary is null or empty !");
    }
    else if (grossInt > max)
    {
        Console.WriteLine("Error: GrossSalary maximum exceeded !");
    }
    else
    {
        rom.Evaluate();
        var tax = model["Employee"]["Tax"].InnerText;
        var NetSalary = model["Employee"]["NetSalary"].InnerText;
        var message = string.Format("Tax: {0} and Net take home salary :{1}", tax, NetSalary);
        Console.Write(message);
    }

    Console.Read();
}

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